A deep surge of moisture into the Southwest will fuel heavy thunderstorms across the region early this week, with flash flooding a likelihood in some areas.
The storms, which could impact cities such as Phoenix and Yuma, Ariz., Palm Springs, Calif., and Las Vegas, Nev., through Tuesday, will feature blinding downpours, gusty winds and possibly some small hail.
Normally dry desert locations could get in on some of the heaviest rain, making flash flooding a near-certainty in some thunderstorms.
Storms will be most widespread during the afternoon and evening hours, with activity trending downward after midnight and through each morning.
The setup for flooding and heavy storms is similar to earlier this month around July 13, when Yuma smashed a record by receiving 1.66 inches of rain, with most of it falling over a few hours' time.
With nearly 2.00 inches of rain so far in July, Yuma is at 722 percent of normal rainfall for the month, which is less than a third of an inch. If more storms impact the city through Tuesday, that figure will likely surpass 1,000 percent!
While monsoon moisture typically ramps up this time of year, numerous more rain records will likely fall over the next couple of days.
Locally more than an inch of rain will fall from some slow-moving storms, enough to cause low-lying, street and gully flooding.
The rush of air away from the showers and storms will enhance wind gusts in all directions and could cause dust storms, known as haboobs.
On Sunday afternoon, a dust storm crossed the Phoenix metro area, turning day into night. Meteorologist Erik Pindrock has more on Sunday's dusty encounter in the Valley of the Sun.
Chances for showers and thunderstorms will wane come Wednesday as high pressure builds west into the Southwest from the Plains.
There still will be a shot at some drenching storms into the weekend, but the threat will become more isolated.
A new storm will swing up from the Southwestern states, bringing another dose of accumulating snow to Philadelphia Tuesday.
Philadelphia International Airport received more snow (8.6 inches) from a single storm this past Sunday than it did all of last winter, when 8.3 inches fell.
A strong offshore flow will result in the first long-duration heat wave of the season across the Perth metropolitan area.
After a day of heavy snow across the mid-Atlantic, ice and rain are adding to power outages, flight delays and hazardous road conditions.
While many may dream of a white Christmas, the reality of one may not be favorable, depending on one's geographical location during the holidays.
Despite near-freezing weekend temperatures, the cold weather looks to ease heading into this week.
Mill city, OR (1987)
Three people were killed and two injured when a moving vehicle was smashed by a falling tree during high winds and heavy rain.
Second great snow in 5 days: Morristown 21"; New Haven 17"; "four feet on level" in eastern Mass. - another high tide.
Sheridan, NY (1908)
Temperature dropped to -41 degrees F., all time low.